Road spraying device



Feb 10, 1942 H. A. CEDERSTROM 2,272,544

ROAD SPRAYING DEVICE Filed Aug 8, 195a e Sheets-Sheet 1 I/V imvro/z#0010 17. mos/757mm. r ///.9 17772 myn s.

Feb. 10, 1942. H. A. CEDERSTROM 2,272,544

ROAD SPRAYING DEVICE Filed Aug. 8, 1938 6 Shee ts-Sheet 3 j I V 2 0% IZ9- 03 Feb. 10, 1942. H. A. CEDERSTROM 2,272,544

7 ROAD SPRAYING DEVICE Filed Aug. 8, 1 938, 6 Sheets-Sheet 4 Feb. 10,1942. H. A. CEbERSTROM 2,272,544

ROAD SPRAYING DEVICE Filed Aug. 8, 1938 a Sheets-Sheet 5 Feb. 10, 1942.H. A. CEDERSTROM 2,272,544

ROAD SPRAYING DEVICE Filed Aug. 8, 1938 6 Sheets-Sheet 6 conduitPatented Feb. 10, 1942 ROAD SPRAYING DEVICE Harold A. Cederstrom,Minneapolis, Minn, as-

signor to Rosco Manufacturing Company, Minneapolis, Minn., a corporationof Minnesota Application August 8, 1938, Serial No. 223,642

Claims.

This invention relates to liquid distributing apparatus and moreparticularly to such apparatus as is used for spraying roadways withliquid surfacing materials such as heavy petroleum residues and cutbackasphalt.

Many types of apparatus have been devised for distributing liquids onroadways, but one great disadvantage has been the inability to preventthe liquid discharge device from dripping after the pump and maincontrol valve have been shut off. This is due to the fact that aconsiderable quantity of liquid is in the discharge device itself anddripping continues until the discharge is substantially empty.Frequently liquid distributors of this general class are moved oversurfaces where the dripping residue in the discharge device isundesirable and many states and other political subdivisions have strictregulations with regard to the dripping of surfacing materials where itis not desired.

Another problem in the handling of this type of apparatus is thenecessity for keeping the liquid which is extremely viscous at ordinarytemperatures in sufficiently fluid condition to permit properdistribution thereof.

In addition when surfacing a roadway it is extremely diflicult todistribute the proper amount of surfacing material over a given area,this, of course, being dependent upon the speed of the distributingvehicle, the rate of discharge and the viscosity of the liquid.

It is, therefore, an object of my invention to provide a liquiddistributing apparatus wherein the liquid can be maintained at adesirable degree of fluidity, where its flow from the discharge devicecan be accurately controlled both with respect to rate and volume andwhere the discharge device can be cut oil and the dripping of residualliquid in the discharge device prevented.

Another object of the invention is the provision of a master controlvalve which will permit flow of liquid through the discharge device,withdrawal of liquid therefrom, circulation of liquid through the supplytank and pump, and the circulation of a flushing liquid through themaster control valve, pump and discharge device to remove the viscoussurfacing liquid from those parts to prevent them from freezing.

A further object of the invention is the provision of a master controlvalve which can be regulated to vary the supply to the discharge device,said valve including means for compensating for pressures built up bythe pump when the discharge outlet is restricted.

Still a further object of the invention is the provision of a dischargedevice which may be shifted laterally with respect to the vehicle whichcarries the apparatus to assist the operator in properly following anestablished guide line during the spraying operation.

Another object of the invention is the provision of a discharge devicein the form of a spray bar, the main portion of which extendssubstantially across the width of the carrier vehicle with spray barextensions projecting laterally of the vehicle, the central spray barportion being in sections with a break joint securing them to permitpivotal movement of said sections and their lateral extensionsparticularly when one of the extensions encounters a stationary object,such 'as a culvert or vehicle on the roadway.

' when desired.

These and other objects and advantages of the invention will more fullyappear from the following description made in connection with theaccompanying drawings, wherein like reference characters refer to thesame or similar parts, and in which:

Fig. 1 is a more or less diagrammatical plan view of my apparatus withsome of the parts broken away to present a suitable general arrangementof the various parts;

Fig. 2 is an enlarged side elevation of the pump and master controlvalve;

Fig. 3 is a horizontal section taken approximately through the center ofsaid control valve in one of its operating positions;

Fig. 4 is a section taken on the line 4-4 of Fig. 3;

Fig. 5 is an end elevation of the control valve d u p;

Figs. 6, '7 and 8 are horizontal sections through the control valveshowing different operating positions than that illustrated in Fig. 3.

Fig. 9 is a rear side elevation of the discharge assembly;

Fig. 10 is an end elevation of said discharge assembly;

Fig, 11 is an enlarged vertical section through the lower portion of theassembly shown in Fig. 10;

Fig. 12 is a section taken on the line l2-I2 of Fig. 11;

Fig. 13 is a section taken on the line |3--|3 of Fig.

Fig. 14 is a section taken on the line |4|4 of Fig. 13;

Fig. 15 is a fragmentary view in partial vertical section of a portionof the spray bar supporting and elevating mechanism; and

Fig. 16 is a perspective view of the core of the master control valve.

In Fig. 1 there is shown a tank |6 which is adapted to hold a quantityof liquid pumped in through the inlet pipe I! from a storage supplythrough th master control valve V and the pump P. Through manipulationof the control valve liquid is pumped from the tank I6 through thecontrol valve and the pump to a header supply pipe l8 for a header l9 toa spray bar which includes generally central spray sections 20 andextensions 2|. This general layout of apparatus is adapted to beassembled on a vehicle for the spraying of the surfaces of roadways.

The core 23 of the control valve is shown in a complete view in Fig, 16.It; comprises a hollow casting 23 with an open end 34 and with theopposite end closed. An operating shaft 24 having a reduced end portion25 extends from the closed end of said hollow core. The open end 34 isadapted at all times to communicate with the conduit or end cap 35regardless of the position of the valve core. core has an opening 33through the wall and said opening is adapted to communicate with eitherof the casing openings 32 and 44 which are shown to be oppositelydisposed in the left-hand end of the valve casing 22. The centralportion of the valve core is provided with three openings 39, 39a and45. These openings are adapted to coincide with either the pump outletwhich lies beneath the valv assembly and communicates through the lowercentral portion thereof or with the valve casing outlet 46 which isconnected by suitable conduits to the discharge device. The righth'andend of the valve core 23 has an opening 40 which in one position of thecore permits the flow of liquid into the valve casing conduit 4| fromwhence liquid is introduced in the tank I6 when the tank is beingfilled. Within the hollow core 23 and extending from the central portionthereof to the left-hand end of said core is a conduit defining a bypass59 which is adapted to function in one of the positions of said corewhen liquid is being drawn back up from the discharge device and into thtank I6. A second bypass is shown in the form of a channel 60 which liesin the outer cylindrical wall of the core 23, said bypass 50 extendingfrom adjacent the medial portion of the core to near the left-hand endof the core and thence at right angles as indicated by the dotted linesin Fig. 16.

The control valve assembly, as has been explained, includes a casing 22which has rotatably mounted therein a core 23. The sprocket 26 isrotatable on the reduced end 25 of the stub shaft 24, and said sprockethas a lug 26a extending therefrom on its outer face. The lug 25a isprovided with an aperture which coincides in one position of thesprocket 26 with a bore 251) which extends radially into the reducedshaft portion 25. A lever arm 25c has a pin-like end 25d which isadapted to slidably fit within the bore 26?: in the shaft end andthrough said bore into the aperture 25a. The pin 25d locks the sprocket26 against movement relative to the reduced shaft portion 25. The leverarm 26c carries a spring retaining element 266 which, as shown in Figs.2,

The lefthand portion of said l 7 and 8, fits over the end of the reducedshaft portion 25, over the lug 26a and in that position preventswithdrawal of the pin 26d from said sh'aft bore 262). However, thespring element 26c can be sprung away from engagement with the lug 26aand the pin 26d can he slipped out of engagement with said lug. Thisdisengages the sprocket 26 from any connection with the shaft end 25 andthe valve core 23 can be moved with the lever 25c independently of thesprocket 25. A combined stop and indicator arm 28 is yieldably carriedby an arm 29 which is mounted upon the flange of the sprocket 25 bymeans of a flange 30 which fits over said sprocket flange and isconnected to the sprocket flange by means of a bolt 21. A plurality ofstop elements 3|, which are better shown in Fig. 5, both limit themovement and indicate the position of the indicator arm 28. The sprocket26 is operated by a chain 25), the ends of which are secured to oppositeends of an arcuate channeled element 269, the latter being mounted on apivot pin 26h and operable by a lever 267'. The pivot pin 26h isjournalled to a bracket 26k which extends down from the end of the valvecasing. In the position of the valve shown in Fig. 7 a port 32 which isconnected to the loading pipe I! is brought into registration with aport 33 in the cor of the valve, and an end opening 34 in said corecommunicates with an end cap 35 which forms the end of the Valve casing.The end cap 35, as best shown in Fig. 2, is connected to a pump inletconnection 35. The pump is preferably of any desired type of rotarypump. The pump outlet indicated at 31 in Fig. 2 and also in Fig. 7communicates with a port 38 in the lower portion of the casing of themain control valve V and the valve casing port 38 is in registrationwith a port 39 in the central portion of the core 23, and liquid ispumped through said core to another core outlet 40 which is inregistration with the valve casing outlet 4|, which in turn connectswith a tank inlet pipe 42, the latter terminating in the tank adjacentthe top thereof.

In Fig. 8 the valve casing port 32 which is connected to the loadingsupply line H is closed since the core 23 has been rotated to bring thecore port 33 out of registration with said casing port 32. With the corein this position the port 33 is in registration with a conduit 44 in thevalve casing, the latter being connected to the tank as shown in Fig. 1.When the pump is started, liquid will flow from the tank through theconduit 44 and the core port 33 and thence from the end of the corethrough the casing and cap 35 and into the pump. Liquid issuing from thepump will come up through the pump outlet 31 in through the core port3911, out of the core port 45, and through the casing conduit 46 whichconnects to the header supply pipe l8 as shown in Fig. 1, and from theheader IS the liquid is supplied to the spray bar elements 20 and 2|.

In order to insure a regulated pressure on the liquid delivered to thespray bars a partition 41 across the interior of the hollow core 23 isprovided with an aperture 48 which has a shoulder as shown. Thisshoulder provides a seat for a valve element 49 which is threaded upon avalve rod 59. The valve rod extends in through the aperture 43 and intoa cage-like spring carrier 5| attached to valve element 49. Carrier 5|carries a compression spring 52 which is held between the inner wall ofthe partition 4'! and a spider 53 journalled on valve rod and havinganns slidably received in longitudinal openings in the cage. A nut 54 onthe inner end of the valve rod 50 retains the spider 53 on the rod. Itwill be noted that the valve rod 50 is threaded and adjustment of thetension of th spring 52 is provided through the medium of an adjustingshaft 55 which extends out of the end of the casing cap 35 and isprovided with a square end 56 to receive a wrench. A slidable connectingelement 51 connects the valv adjusting rod 55 with the valve rod 50.

With the master control valve set in the position shown in Fig. 8 thepressure relief valve 49 can be set to any desired tension, and if thepump exceeds the pressure for which the relief valve is set, said valvewill be unseated and certain of the liquid will be bypassed through thethe relief valve from where it will flow out of the left-hand end of thevalve core and through the valve casing end cap 35 and be recirculatedthrough the pump P.

It should be noted that my control valve is so constructed that it ispossible to adjust the volume of flow through said control valve and thepump to the spray bars. Slight adjustment of the valve core 23 fromcomplete registration of the ports in the position shown in Fig. 8 willreduce the flow from the supply tank through the valve casing conduit44, will reduce the effective port opening from the pump outlet throughthe core inlet port 39a, and will, of course, also reduce the effectivearea of the opening between the core port 45 and the casing conduit 46which connects with the pipe l8 running to the spray bar header l9.Again in such an adjusted position of the valve during the sprayingoperation if pressure backs up from the spray bar sections, the pressurerelief valve 49 will come into play to bypass liquid from the valve coreand around to the pump. It will be seen that when the control valveassembly is in the spraying position and it is adjusted slightly toreduce the flow to the spray bars, this will also cause the valveassembly to be set partially in the reverse suction position shown inFig. 6 and described below so that there is in effect a feed to thespray bars which is ofiset to some extent by the application of suction.The ability to set the valve in this position permits accurate controlof the amount of liquid being discharged from the spray bars, and theoperator I of the apparatus can accurately determine just how muchliquid is being sprayed over a given area to meet the particularrequirements of each different surfacing operation.

In Fig. 6 the valve is set for what may be termed its reverse suctionoperation. Such an operation is utilized when spraying has beencompleted and the withdrawal of liquid from the spray bars is desired.In changing from spraying position to the reverse suction position thepump, as will be seen, need not be stopped nor reversed, but suctionwill be efiected merely by manipulation of the valve core. In suchsuction position the central valve casing conduit 46 is in communicationwith a core port 3911 which is in the medial portion of the core butwhich is 90 removed from the core outlet port 45 used in spraying.Liquid is drawn by the pump from the spray bar assembly through saidcasing conduit 46, the core port 390, and thence through a bypass 59 ina segment of the left-hand end of the core from where the liquid flowsthrough the casing end cap 35 and through the pump P. It will be noted,as best shown in Fig. 4, that the plate 5911 which is located betweenthe end of the valve core and the casing end portion 35 will maintainthe bypass 59 closed except when the valve is in the position shown inFig. 6 for the reverse suction operation. In'that position the cut outportion of the plate 591: is in coincidence with the end of the bypass59, but at other times the bypass is obstructed by the remainder of theplate which is cut away. Liquid flowing from the pump outlet 31 isconducted through a second bypass 60 which is a channel formed in theouter surface of core 23 as shown in Fig. 6 and partially in Figs. 7 and8, this bypass communicating with the valve casing conduit 44 and thenceinto the tank through what is normally the tank outlet connection 44a.

Frequently when apparatus of this type is left standing for aconsiderable time or even for a short time in low temperatures, thespraying liquid will congeal in the pump and valves as Well as in thespray bars, and it is a difficult and tedious operation to heat thevarious parts so that liquid will again flow through them and the partsfunction properly. For that reason I have provided means for circulatinga flushing liquid such as a light petroleum distillate through the pump,the master control valve V, and through the spray bars to thoroughlyclean them. This flushing operation is accomplished with the mastercontrol valve in the position shown in Fig. 3.

Normally, except for the flushing operation, the control valve core 23is movable through That movement is normally limited by the right andleft-hand stops 3l' shown on the valve casing in Fig. 5. Because of thefact that the arcuate segment 269 which carries the chain 26] which inturn operates the sprocket 26 and for another reason which will soonbecome apparent, the auxiliary valve core operating lever 250 isdisengaged from the lug 26a on the sprocket 26 as previously describedand said auxiliary operating lever 260 is moved to the downwardlyextending vertical position shown in Fig. 5 to bring the valve core intoflushing position. The reason for not constructing the valve operatingmechanism so that the combined indicator and stop arm 28 can be rotateda full 360 so that it can be turned with the valve core to the flushingposition, is that kerosene, a relatively highly volatile petroleumproduct, is generally used for the flushing operation, and if by anychance kerosene will run through the valve and pump when the pump shouldhappen to be in communication with the supply tank l6, kerosene mightget into said tank and later on when the apparatus is being used theliquid in the tank would be subjected to heat to render it more fluidand any kerosene in the tank would be very likely to cause an explosion.For this reason with my arrangement the indicator and stop arm can beleft in any position between and above the right and left-hand stops 3|on the valve casing and the auxiliary valve core operating lever 26cmoved to its downward position shown in Fig. 5 to bring the valve corein proper position for flushing, such a valve operation being an unusualone and different from other movements of the valve so that the operatorwould naturally be on guard when bringing the valve to flushing positionand will take more care in being sure that the valve is positively setin its flushing position before kerosene .is introduced into theapparatus.

Kerosene is introduced after setting of the master control valve influshing position as shown in Fig. 3 through an intake conduit 6| in theupper portion of the valve casing end cap 35 from any suitable source ofkerosene supply. A valve 62 may be used to cut off the conduit 6! whenit is not in use. Kerosene or some other suitable flushing liquid whenintroduced in this manner will flow into the pump P, and when the pumpis started the flushing liquid will be forced out of the pump outlet 37,out of the valve core port 39, and into the conduit 46 in the casing.The flushing liquid will be forced from the conduit 65 through theconduit E8, the spray bar header and finally through the spray barsthemselves. The spray bars can then be cut ofi by closing the valves 63and 85 which are indicated in Fig. 1, and the pump will then begin tobuild up pressure which will open the relief valve 69, and the flushingliquid will be circulated through the master control valve and the pumpuntil those two units have been completely cleaned. The valves 64 and 65on the spray bar header i9 may again be opened and the flushing liquidexhausted from the apparatus through the spray nozzles. When theflushing operation has been completed the pin 26d on the auxiliaryoperating lever 25c can be moved back up into the lug 26a whereupon thespring catch 262 will lock the sprocket 26 to the reduced end of thestub shaft 25. The valve is then in condition for loading, spraying orreverse suction operations.

The pipe l8 which runs from the master control valve to the spray barheader i9 is shown extending through the bottom portion of the tank is.This is done to maintain the oil in heated condition so that it willflow more easily, the tank IE being maintained in heated condition by asuitable burner 65 whose combustion nozzle 6'! extends into a combustionspace 68 which is built into the tank IS. The type of burner isunimportant and is merely indicated diagrammatically. As shown in Figs.1 and 9 the pipe l8 connects with the header l9 between the two valves64 and 65 adjacent the ends of said header. At each end of the header asleeve 69 is journalled with suitable packing. The sleeve 69 is part ofan assembly carrying another pivotal connection 69a which is normally ona vertical axis. This pivotal joint is in turn connected to a shortsection of pipe H1 which normally extends rearwardly at right angles ofthe header l9 and makes a pivotal connection with an upright H adjacentthe upper end of said upright. The pivotal connection 69, the joint 69a,and the connection 72 between the short pipe section l and the uprightare arranged to conduct the liquid which flows from the header to theupright pipe H.

The vertical pipe section ll, as best shown in Figs. 10 and 11,telescopes into a lower vertical pipe section 73 with a sliding fit. Thelower vertical pipe section 13 carries a flange M, and a collar 75 onthe upper pipe section H fits down inside the collar M to retain asuitable packing material 16. As shown in Fig. 11, the upper pipesection H carries another flange T! which supports a bolt I8, said bolthaving threaded thereon a pair of nuts 19 and 80 which are adapted totightly hold the packed joint just described. When vertical adjustmentof the spray bars which are supported by the lower pipe sections 13 isdesired, the nuts 19 and 80 are loosened and the desired verticaladjustment made.

Each of the main or central spray bar sections 20 makes connection withthe casting 8| as indicated in Figs. 10 and 11. The spray bar extensions2! are also connected to the casting 8!, as shown in Figs. 10 and 11.The connection of the main spray bar sections 20 is a rigid one withrespect to said casting, but the spray bar extensions 2! are pivotallyconnected. The latter are pivoted to permit them to be swung up in anout of the way position so that they do not extend laterally of theapparatus and carrier vehicle, as shown in Figs. 9 and 10, and in thatupwardly swung position the extensions are cut ofi so that liquid willnot flow into them. This is accomplished by providing a lateral opening84 in the outer portion of the casting 3|, as shown in Fig. 12, and whenthe spray bar extensions 2lc swing up to a more or less verticalposition the openings 86 will be out of registration with the ends ofsaid spray bar extensions. An end cap 85 on the lower end of the lowerpipe section 73 and a similar end cap 86 on the outer portion of thecasting 8| provide for simple disassembling and reassembling of theparts just described.

The central spray bar sections 28 are shown in Figs. 1 and 9 extendingtoward each other and they are held in this position by a rod 3'! whichis retained in adjacent sleeve-like receptacles 88 on the adjacent endsof the spray bar sections 26. Cotter pins 89 shown in Fig. 1 permitremoval and replacement of the pin 62'. The connecting pin 8'! ispreferably formed of cast iron to form a break joint between the centralspray bar sections 20. This break joint is provided for the reason thatthe spray bar extensions 2| are adapted to be extended laterally fromthe sides of the carrier vehicle upon which the apparatus is mounted,and at times said extensions are likely to come into contact with someobject along the roadway such as a culvert or another vehicle. In suchan event a blow on either of the spray bar extensions 2| will snap thebreak joint pin 8! and prevent serious damage to the apparatus. Areplacement pin can be quickly inserted and the spraying operationcontinued. When such a break occurs both the extensions 2! and thecentral spray bar sections 20 will pivot with the casting ill on thelower vertical pipe section 13.

Both the spray bar central sections 29 and the extensions 2! areprovided with spray nozzles 90, enlarged views of which are shown inFigs. 13 and 14. The nozzles are provided with elongated apertures EHfrom which the liquid issues, and said nozzles are threadedly secured inthe spray bar sections. Each of the nozzles is provided with a shortsection of tubing 92 which extends upwardly and inwardly into the spraybar a substantial distance above the bottom thereof. This constructionprevents any small quantities of liquid which may remain in the spraybars after the reverse suction operation from dripping from the nozzles.While the application of suction on the spray bars withdraws most of thesurfacing liquid from them and from the conduits supplying the spraybars, there will, of course, be a certain amount which will drain backinto the spray bars after termination of the application of such. Thisresidue is the liquid which is retained in the spray bars by the shortpieces of tubing 92.

The spray bar assembly is capable of various adjustments andmanipulations. One of these is a substantially vertical adjustment withthe entire spray bar assembly pivoting upwardly on the pivotalconnections 69 at the ends of the header 19. Referring to Figs. 1, l0and 15 the header H) has a'pair of brace elements 93 journalled withstraps 94, said straps carrying pivot bolts 95 which go through theinner ends of the braces 93. Intermediate portions of the braces 93 restupon portions of a housing 930, which are supported by some convenientportion of the carrier vehicle which need not necessarily be shown, andwhen said braces are pivoted laterally on the vertical pivot bolts 95,said intermediate portions of the braces will merely slide upon theup-turned lower edge portions of the housing 93a, as indicated in Fig.15. Of course, the braces 93 may be supported in this manner or in anyother suitable manner. The braces are connected by an elongated arm 96which extends beyond the braces and is pivotally connected to the upperends of each of the upper vertical pipe sections H. Above the brace andbar construction a rod 91 is mounted in suitable journals 98 which aresecured to a part of the frame work 99 of the carrier vehicle. Ropes orcables I60 are connected between the rod 91 and the braces 93, and oneend of the rod 9'! is adapted to receive a crank l! so that when the rod97 is rotated the cables will be wound therearound and the braces 93 andcross bar 96 elevated to lift the spray bar assembly. This adjustment isprovided to permit the spray bars to be elevated when the vehicle is inmovement and the spray bars are not in use, or to secure verticaladjustment with respect to the roadway when conditions require it.

The spray bar extensions 2!, as has been explained above, can be swungup in inoperative position, as shown in Figs. 9 and 10, said extensionsbeing supported in their upper position by brackets I02, as best shownin Fig. 10. When they are in their lowered position they can be held byany suitable means such as chains I63 which are connected to the crossbar 96 and to said spray bar extensions. The apparatus can be operatedwith either one of the spray bar extensions in their lowered position orin their upwardly swung inoperative position. In addition lateraladjustment of the entire spray bar assembly relative to the carriervehicle may be Obtained by pivoting said assembly on-the pivotalconnections 69a and 12. This lateral movement may be effected by meansof a lever Hi4 which is pivoted at N35 to the carrier vehicle framecross piece 99, the lower end of said lever having a link connection I66with the cross bar 96. The link connection is preferably provided withball joints [6! and H18. The lateral movement of the spray bars isparticularly adapted for use to assist the operator in following a guideline or the edge of the road and still maintain the spray bars in theirproper position relative to the roadway.

The spray bar assembly may be shifted and with a simple alterationconverted into a double spray bar, with spraying sections lyingsubstantially parallel. This rearrangement is shown in dotted lines inFig. 1. The spray bar extensions 2| have been swung inwardly and theinner main spray bar sections 26 swung outwardly, a movement permittedby the casting 8| which, as described above, pivots on a vertical axis.The spray bar extensions have end caps 21 a which are removed to permitthe coupling of additional sections of pipe Zlb having nozzles as in theother spray bar sections. The added pipe sections .Zlb may, of course,be of such length as to extend out to the ends'of the laterallyextending main spray bar sections 29, if desired.

' As shown in Fig. 1,;when in the double spray bar position, theelements lieslightly off of a true transverse line, this positioningbeing necessary because duplicate parts of the spray bar assembly lieopposite each other and naturally cannot occupy the same space.

The valves 64 and 65 adjacent the ends of the header [9 may becontrolled by levers I09 and I I0, said levers being positionedsomewhere near the same general level of the upper end of the lateralmovement lever I04, and the rear end of the carrier vehicle which issuggested by'the cross frame 99 may be provided with a platform so thatthe operator can easily reach any of the valves which he wishes tocontrol as well as the spray bar shifting lever I04.

Sometimes it is desirable to maintain the liquid in the tank [6 in suchcondition that it will readily flow either before or after a sprayingoperation. Under these circumstances, of course, the spray bar assemblyitself is not in use so the valves 64 and 65 in the header [9 will beclosed and a valve III which is located in a short pipe H2 connectingthe header directly with the tank I6 will be opened by movement of itshandle H3.

The master control valve V is set in the spraying position illustratedin Fig. 8, and the pump will circulate liquid through the master controlvalve, the pipe l8, the medial portion of the header l9, and through theshort pipe section H2 to the tank. Of course, liquid heated by theburner 66 is under these conditions being constantly withdrawn from thetank and being pumped around to complete the circulatory action.

The aforementioned housings 93a that support the braces 93 and coverportions of the header and the valves therein are connected betweenadjacent upper corners by anotherhousing portion H4 whichv connectshousings 93a, and suitable side plates or doors may be secured to theentire housing unit to more completely enclose the valves 64 and 65.

Referring back to Fig. 11 it will be noted that the casting BI and thelower vertical pipe section 13 are so associated and constructed thatthe lower end of said pipe section 13 is below the connections betweensaid casting BI and the spray bar sections 20 and 2|. That portion ofthe pipe 13 which lies below these connections provides a sump H5 whichis adapted to collect a considerable percentage of the liquid which mayotherwise collect in the spray bars after a spraying operation and afterthe application of suction has been discontinued. As a matter of fact,the suction can be applied for a short period after liquid has had timeto collect in the sump H5 and at least a portion of the liquid which hasaccumulated in the sump will be drawn up into the tank by the pump P.

A spray nozzle H6 similar to the nozzles in the spray bar elements ispreferably placed in each of the castings 8|, as shown in Figs. 9 and11, so that there will be no gap between the last of the nozzles in eachof the spray bars 20 and the end nozzle in each of the spray barextensions 2 I.

From the foregoing description it will be seen that I have provided aroad spraying apparatus which is extremely flexible in operation andwhich, while comprising a number of parts, is actually capable of beingsimply controlled and wherein the master control valve can be quicklyand easily moved to various positions to load the tank, feed liquid tothe spray bar assembly, withdraw liquid therefrom, circulate heatedliquid when the spray bar is cut off, and permit the flushing of thepump, the master control valve itself, and the spray bars. In additionthe spray bar assembly itself may be moved vertically or laterally, andit may be also manipulated s that at least the medial portions of thespray bar assembly can be converted into a double spray bar arrangementwhen desired. The provision of a break joint between the central spraybar sections is also of importance because of the great saving in repairwork in the event one of the spray bar extensions should strike someobject along the roadway.

The above described apparatus has been constructed in accordance withthis disclosure and has been repeatedly and successfully operated.

It will, of course, be understood that various changes may be made inthe form, details, arrangement, and proportions of the various partswithout departing from the scope of my invention.

What is claimed is:

1. In a liquid distributing apparatus and the like, a tank, a pump, adischarge device and an adjustable valve assembly adapted to be con-.

nected with said tank, said pump and said discharge device in oneposition to cause a flow of liquid from said tank through said pump tosaid discharge device, said valve assembly being adjustable to a secondposition to cause withdrawal of liquid from said discharge device, saidvalve assembly including means for admitting a flushing liquid and beingadjustable to a third position wherein the connection with said tank isclosed and the connections with said pump and with said discharge deviceare opened to permit flushing liquid to be directed through said pump,said valve assembly and said discharge device, and means for closingsaid discharge device when said valve assembly is in said thirdposition, and flushing and by-pass means associated with said valveassembly permitting circulation of flushing liquid through .said pumpand said valve assembly when said discharge device and tank connectionare closed.

2. The structure in claim 1, and said by-pass means comprising ayieldable valve adapted to open under pressure when said dischargedevice is closed, to permit circulation of flushing liquid through saidvalve assembly from its connection with the outlet side of said pump toits connection with the inlet side of said pump and thence through saidpump.

3. In a liquid distributing device and the like,

including a tank, a pump and a discharge device, an adjustable valveassembly adapted to be interconnected with said tank, said pump and saiddischarge device, and including, in one position thereof, means fordirecting flow of liquid from said tank to said discharge device, saidvalve being adjustable to a second position connecting said tank, pumpand discharge device, and having flow control means for producingwithdrawal of liquid from said discharge device to said valve and pumpwhile cutting off flow to said discharge device, and said valve beingadjustable to positions intermediate said first and second positions toproduce a variable flow of liquid to said discharge device, thewithdrawal of liquid from said discharge device offsetting excess flowof said discharge device.

4. In liquid distributing apparatus, including a tank having an inletand an outlet, a pump and a discharge device, a valve casing havingports connected to the inlet and outlet of said tank, to the inlet andoutlet of the pump and to said discharge device, and an adjustable corein said casing having passages and ports adapted to, in one positionthereof, establish communication with certain of the ports in saidcasing and in other positions thereof to establish communication withcertain other ports of said casing, the arrangement of ports in the coreand casing being such that communication can be established between saidtank outlet, the inlet and outlet of said pump and said discharge deviceto effect discharge from said tank in one position of the core, inanother position of the core affording communication between saiddischarge device and said pump inlet, and also between said pump outletand said tank, whereby liquid can be supplied to or withdrawn from saiddischarge device, and the passages and ports in said core being sorelated to the ports in said casing that said core can be set atintermediate positions between said above mentioned positions tosimultaneously varythe flow toward and away from said discharge device.

5. The structure in claim 4 and said valve means including a yieldablevalve element connected between the outlet and inlet f said pump, saidelement being adjustable to a predetermined pressure resistance maximumwhereby excess pressures will be relieved by bypassing of liquid throughsaid yieldable valve from said pump outlet to said pump inlet.

'HAROLD A. CEDERSTROM.

